Fix device major minor numbers

Cargo.toml

@@ -21,7 +21,7 @@ name = "exa"
 ansi_term = "0.12"
 glob = "0.3"
 lazy_static = "1.3"
-libc = "0.2"
+libc = "0.2.135"
 locale = "0.2"
 log = "0.4"
 natord = "1.0"

src/fs/fields.rs

@@ -194,8 +194,8 @@ pub enum Size {
 /// - <http://www.lanana.org/docs/device-list/devices-2.6+.txt>
 #[derive(Copy, Clone)]
 pub struct DeviceIDs {
-    pub major: u8,
-    pub minor: u8,
+    pub major: i64,
+    pub minor: i64,
 }
 
 

src/fs/file.rs

@@ -8,6 +8,7 @@ use std::os::windows::fs::MetadataExt;
 use std::path::{Path, PathBuf};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
+use libc::{major, minor};
 use log::*;
 
 use crate::fs::dir::Dir;
@@ -333,15 +334,13 @@ impl<'dir> File<'dir> {
             f::Size::None
         }
         else if self.is_char_device() || self.is_block_device() {
-            let device_ids = self.metadata.rdev().to_be_bytes();
+            let device_ids = self.metadata.rdev();
 
-            // In C-land, getting the major and minor device IDs is done with
-            // preprocessor macros called `major` and `minor` that depend on
-            // the size of `dev_t`, but we just take the second-to-last and
-            // last bytes.
+            // SAFETY: `major()` and `minor()` can return an unsigned integer
+            // of at most 32bits, so an `i64` is going to accomodate them well
             f::Size::DeviceIDs(f::DeviceIDs {
-                major: device_ids[6],
-                minor: device_ids[7],
+                major: unsafe { major(device_ids) as i64 },
+                minor: unsafe { minor(device_ids) as i64 },
             })
         }
         else {